This fails in Harrisburg for a specific reason: the age of the housing stock and the winters line up badly. Most doors across this service area went in when the house was built, which for the bulk of the stock means the 1960s or 70s - old enough that original hardware is still common, young enough that owners assume it's fine because it still opens. Add a cold-and-severe climate, and every winter puts real stress on steel, grease, and alignment that a door in a milder region wouldn't see at the same rate.
Across the households we cover - 132,270 total, with 54,312 of them owner-occupied houses - that adds up to a lot of doors built the same decade, aging the same way, hitting the same cold snaps at the same time. Wormleysburg sits two miles out, Uptown is a mile north-northwest, and Camp Hill, Lemoyne, and Enola are all within three miles - close enough that a hard freeze doesn't hit one town's doors, it hits all of them the same week. That's the pattern that makes seasonal maintenance worth doing before the cold sets in, not after a door stops moving.